Fix duplicate _freq_ elements in default output file names (closes #214)

climix/main.py

@@ -126,7 +126,13 @@ def guess_output_template(datafiles):
         base = unique_bases.pop()
         start = min(starts)
         end = max(ends)
-        output_template = f"{{var_name}}_{base}_{{frequency}}_{start}-{end}.nc"
+        if "_day_" in base:
+            base = base.replace("_day_", "_{frequency}_")
+        elif base.endswith("_day"):
+            base = base.replace("_day", "_{frequency}")
+        else:
+            base += "_{frequency}"
+        output_template = f"{{var_name}}_{base}_{start}-{end}.nc"
     return output_template